google app engine - GAE Python NDB Datastore - No need for memcache.set? -

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the documentation (https://cloud.google.com/appengine/docs/python/ndb/) states

ndb uses memcache cache service "hot spots" in data

i using memcache follows: memcache.set(key=(id), value=params, time=0)

that expires (auto flushes) pretty , use ndb datastore. thought have put key-value in both ndb , memcache, check both. being done automatically ndb?

ie. ancestor_key = ndb.key("book", guestbook_name or "*notitle*")

greetings = greeting.query_book(ancestor_key).fetch(20)

would implicitly set memcache ?

and when read ndb, implicitly try memcache.get(key) first?

thanks patience.

edit - tried:

as test tried this: 

class book(ndb.model):     content = ndb.stringproperty()   class update(webapp2.requesthandler):      def post(self):          p1='1'          p2='2'          p3='3'          p4='4'          p5='5'          id='test'         paramarray = (p1,p2,p3,p4,p5)           book = book(name=id,value=paramarray)          # or likes -  book = book(ndb.key(id),value=paramarray)                   book.put()

both versions error out. trying key of var id values of paramarray

edit 2 daniel, thank everything.

have follow formatting questions, ask new question.

yes; see full documentation on ndb caching. basically, every write cached both in request-local in-context cache, , in main memcached store; key in both caches first before falling real datastore.

edit can't understand why think example work. defined model content property, try set name , value properties on it; naturally fail.

you should go through ndb documentation, gives introduction using model class.


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